Map values in template

Configuration
1

Can this be done somehow ?
I’dd like to convert an analog value from a modbus sensor to a percentage value.

value_template: '{{map(sensor.Sensor1, 28650, 4940, 0, 100)}}'
2

So the value from the sensor is 0 to 1 ???

“{{ states(‘sensor.mysensor’) | float * 100 }}”

Not sure what the : 28650 and 4940 represent

3

Yeah you’re going to have to explain what you want. That template means nothing.

4

Sorry bit confusing maybe.

28650 is max value of wago analog plc input
4940 is min value of wago input
28650 would translate to 0
4940 would translate to 100

The value of sensor 1 would then be (mapped) to a percentage readout.

map(sensor.Sensor1, 28650, 4940, 0, 100)

5

Based on those requirements, the formula is:

(28650 - x)/237.1

I don’t know where you are using the value_template but here’s one way to implement the formula:

{{ (28650 - states('sensor.sensor1')|float) / 237.1 }}

You can test it in Developer Tools > Template.

2 Likes
6

Bare the stupidity with me. :sleeping:
I believe the map() is a c++ function, but completly missed the reformat to this formula. Will test it later today.

Thank you very much for the hint!

7

If after trying my suggestion it proves to answer your question, please mark my post (above) with the Solution tag. It will automatically place a check-mark next to the topic’s title which indicates to other users that this topic has an accepted Solution. It also automatically places a link beneath your post that leads to the Solution post. All of this helps other users who may be looking for an answer to a similar question.

8

i was trying to do somthing similar but with voltage for my home solar battery, ive tried

- platform: template
  sensors:
    testtesttest:
      friendly_name: "Testtesttest"
      unit_of_measurement: '%'
      value_template: >
        {{ state_attr('sensor.voltronic_battery_voltage', 'V')|float|min(49)|max(57.4) }}

but it just displays 57.4% constantly

but following this i got it working

my min value for the battery needs to be 49v and the max will be 57.4v so that would be the 0-100% scale but the sensor.voltronic_battery_voltage can be anywhere between those voltage values say 55volts which would need to be converted into a percentage

worked out by

min value (49.0) diveded by 100 = 0.49
max battery value (57.4) divided by 100 = 0.574

then i done 0.49-0.574 = -0.084

then i done the above formula

ended up with

- platform: template
  sensors:
    testtesttest:
      friendly_name: "Testtesttest"
      unit_of_measurement: '%'
      value_template: >
        {{ (49 - states('sensor.voltronic_battery_voltage')|float) / -0.084 | round(1)}}